The ol' cobweb knot gets a bit dusty and stops being as sticky as time goes by....Someone recently asked me to play an Ozzy song that I used to know really well when I was 13, in 1982, and I have not played that song since around that time. I was able to play it almost note for note, right away. But, songs that I learn now that I'm older will fade from memory in a matter of weeks if I do not regularly play them.